On Minecraft: Bedrock Edition, on a Windows (or device where achievements are handled by Xbox), whenever I walked in range of a Conduit, placed by another player, it automatically gives you an achievement, even if you didn’t place the Conduit. This may be caused by the game checking for the effect and then giving the acheivement.
Don’t most achievements on this game work like this though? I got the Uh-Oh achievement when my friend did the requirements, I wasn’t even close to him when he exploded the sulfur cube